Adding border to CSS triangle [duplicate]
One way to do it is the create an inner triangle which is smaller. .triangle-left { width: 0; height: 0; border-top: 23px solid transparent; border-bottom: 23px solid transparent; border-right: 23px solid red; } .inner-triangle { position: relative; top: -20px; left: 2px; width: 0; height: 0; border-top: 20px solid transparent; border-bottom: 20px solid transparent; border-right: 20px … Read more